Research Papers

Experimental Investigation of a Switched Inertance Hydraulic System With a High-Speed Rotary Valve

[+] Author and Article Information
Min Pan

The State Key Laboratory of Fluid Power
Transmission and Control,
Zhejiang University,
Hangzhou 310027, China
e-mail: mpan@zju.edu.cn

Nigel Johnston, James Robertson, Andrew Plummer, Andrew Hillis

Department of Mechanical Engineering,
University of Bath,
Bath BA2 7AY, UK

Huayong Yang

The State Key Laboratory of Fluid Power
Transmission and Control,
Zhejiang University,
Hangzhou 310027, China

1Corresponding author.

Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received December 24, 2014; final manuscript received July 21, 2015; published online September 14, 2015. Assoc. Editor: Heikki Handroos.

J. Dyn. Sys., Meas., Control 137(12), 121003 (Sep 14, 2015) (9 pages) Paper No: DS-14-1547; doi: 10.1115/1.4031325 History: Received December 24, 2014; Revised July 21, 2015

This paper reports on experimental investigations of a switched inertance hydraulic system (SIHS), which is designed to control the flow and pressure of a hydraulic supply. The switched system basically consists of a switching element, an inductance (inertance), and a capacitance. Two basic modes, a flow booster and a pressure booster, can be configured in a three-port SIHS. It is capable of boosting the pressure or flow with a corresponding drop in flow or pressure, respectively. This technique makes use of the inherent reactive behavior of hydraulic components. A high-speed rotary valve is used to provide sufficiently high switching frequency and to minimize the pressure and flow loss at the valve orifice, and a small diameter tube is used to provide an inductive effect. In this paper, a flow booster is introduced as the switched system for investigation. The measured steady-state and dynamic characteristics of the rotary valve are presented, and the dynamics characteristics of the flow booster are investigated in terms of pressure loss, flow loss, and system efficiency. The speed of sound is measured by analysis of the measured dynamic pressures in the inertance tube. A detailed analytical model of an SIHS is applied to analyze the experimental results. Experimental results on a flow booster rig show a very promising performance for the SIHS.

Copyright © 2015 by ASME
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Fig. 1

Schematic diagram of SIHS: (a) flow booster and (b) pressure booster

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Fig. 2

Schematic of an analytical flow booster SIHS model

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Fig. 3

Supply pressure and flow rate with an ideal instantaneous switching transition

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Fig. 4

Schematic of the rotary valve

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Fig. 5

Rotary valve arrangement

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Fig. 6

Schematic of steady-state test

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Fig. 7

Leakage tests results with a switching ratio of 0.5

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Fig. 8.

Leakage routes: (a) leakage from rotor slots to stator lands and (b) leakage from control shaft to rotor slots

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Fig. 9

Valve orifice flow-pressure characteristics

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Fig. 10

Schematic of the test rig

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Fig. 12

Experimental DP with delivery flow rate of 0 l/min (HP: high supply pressure; LP: low supply pressure; and DP: delivery pressure)

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Fig. 13

Experimental DP and pressure loss with delivery flow rate of 7 l/min (HP: high supply pressure; LP: low supply pressure; and DP: delivery pressure)

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Fig. 14

System flow loss with the switching frequency of 189 Hz, 60 Hz, and optimal values: (a) experimental results and (b) analytical results

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Fig. 15

Experimental and analytical system efficiency with a delivery flow rate of 7 l/min

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Fig. 16

System flow loss with supply pressures of 60 bar and 20 bar

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Fig. 17

Predicted system efficiency and pressure/flow characteristics. Contour lines represent efficiency in percentage, straight lines represent switching ratios indicated by the legend.

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Fig. 18

Predicted system efficiency and pressure/flow characteristics for throttle valve control. Vertical contour lines represent efficiency in percentage. Curved lines represent different throttle valve settings, legend represents flow rate at 70 bar pressure drop across the throttle valve.




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